Brush mounting



C F. KETTERING-AND W. A. CHRYST. BRUSH MOUNTING. APPLICATION FILED APR.H, 1919.

1,405,519. Patented Feb. 7, 1922'.

LTJITNEESEE @M CHARLES F. KETTERING .AND WILLIAM A. CHRYST, OF 1) THEDAYTON ENGINEERING LABORATORIES COMPANY,

AYTON, OHIO, ASSIGNORS TO A CORPORATION OF OHIO.

BRUSH MOUNTING.

Original application filed October 11, 1915, Serial No. 55,160. Dividedand thi Serial No. 289,204.

To all whom it may concern:

Be it known that we, CHARLES F. KETTER- ING and lVILLIAMA. CHRYs'r,citizens of the United States of America, residing at Dayton, county ofMontgomery, State of Ohio, have invented certain new and usefulImprovements in Brush Mountings. of which the following is a full,clear, and exact description.

This invention relates to dynamo electric machines, and has for one oftheobjects of the invention to provide improved means for mountingbrushes of the. dynamo in such a manner as to facilitate assembly in themanufacture of the machine, and removal therefrom in case of replacementor adjustment.

Other and further objects and advantages ofthe present invention will beapparent from the following description, reference being had to theaccompanying drawings, wherein preferred embodiments of the presentinvention are clearly shown.

.which includes pole pieces 22 and 23.

This application is a division of our copending application, Serial No.55,160, filed October 11, 1915, and patented May 13, 1919, No.1,303,331.

In the drawings:

Fig. 1 is an end view of a dynamo electric machine constructed inaccordance with the present invention, the commutator housing beingshown in section; and

Fig. 2 is a top plan View of the brush holding device shown in Fig. 1,certain parts being shown in section.

In the drawings, a dynamo electric machine 20is provided with a fieldframe 21 A field winding 24 mounted on the frame, when energized by avpassage of an electric current produces a. magnetic field between thepole pieces 22 and 23. An armature. not shown, cooperates with thismagnetic field to produce an electric current, and said armature isconnected with a commutator 25.

A mounting plate30 is provided with hooked portions 31 and 32 whichengage over bolts 33 and 34 which are secured to the frame 21. Aterminal bolt 35 passes through the mounting plate 30 and is thoroughlyinsulated therefrom by means of suitable washers 36 and 37 and a sleeve38. This bolt 35 is provided with a sleeve 39 which forms asupport for aspring 40, as well as Specification of Letters Patent.

Patented Feb. '7, 1922.

s application filed April there is an insulating sleeve 44. whichcarries a spring 45, one end of which is secured to the brush holder 46,while the other end thereof is also secured to the supplemental bolt 43,but is insulated therefrom in any suitable manner as by insulatingcollar or washer 47 in order that the brush holder 46 will be insulatedfrom the supplemental .bolt 43. The function of this spring 45 is toniaintainthe brush 48 in contact with the generator commutator.

The brush holder 46 is mounted adjacent to the insulating sleevev 44,and comprises a pair of plates 49 and 50, secured together by means ofbolts 51, which pass through elongated slots 52 formed in the plate 49.By loosening-these bolts 51 it will readily be seen that the brush arm46 may be lengthcned or shortened in order to adjust the brush 48relatively to the commutator surface. A nut 53 having engagement withthe terminal bolt 35 maintains the brush holder 41 in position, and apin 54 passing through bolt maintains brush holder 46 in positlion.

The mounting of the other main commutator brush upon. the mounting plate30 is similar to that of the brush 42. A terminal bolt 60 passes throughmounting plate 30 and is insulated therefrom by means of washers 61 and62 and a sleeve 63. Bolt 60 is provided with a sleeve 64, which forms asupport for a spring 65, as well as a spacing block for the brush holder66. This brush holder 65 carries the other main commutator brush 67 insuch aposition that it will readily engage with the generator commutator25. The spring 65, which tends to hold the commutator brush 6? incontact with commutator 25 is connected at one end with a stud 68supported by mounting plate 30 but insulated therefrom, while the otherend of said spring 65 is fastened to any suitable part of the brush arm66. A head to the terminal clip 70 which is secured upon the terminalbolt 35. The other end of field winding 24 is connected at 71 with thebrush arm 46 which carries the supplemental or third brush 48. The othermain lead of the generator is connected with the terminal clip 7 2secured uponthe terminal bolt 60.

It will be apparent from the foregoing description that the brushes ofthe dynamo electric machine together with the supporting means thereforhave been combined in a unitary structure which may .be secured in placeupon the generator frame in a very simple manner. In order to remove thebrushes from the generator for adjustment or replacement, it is onlynecessary to loosen the bolts 33 and 34 afterwhich the mounting platecarrying the main brushes and the third brush may be removed as a unitfrom the machine. This structure is advantageous froma manufacturingstandpoint, in that the brushes and brush support may be assembledtogether in a unitary structure separate from the assemblin of the otherparts of the dynamo. Additional advantages result from, the easy removalof the brushes from the dynamo for cleaning and adjustment while inservice.

While the form of mechanisms herein shown and described constitutespreferred formsof embodiments of the invention, it is to be understoodthat other forms might be adopted, all coming within the scope of theclaims which follow.

1. Ina dynamo electric machine; the combination with a field frame and arotatable armature and commutator; main brushes cooperating with thecommutator; a supplemental or regulating brush cooperating with thecommutator; and means for mounting said brushes upon the generatorframe, said means comprising in a unitary structure a mounting plate,terminal bolts secured upon the mounting plate but insulated therefrom,the main brush holders pivotally mounted upon the said terminal boltsand supporting the main brushes, and a supplemental brush holdercarrying the supplement brush pivotally mounted upon one of the terminalbolts but insulated therefrom; and means for 'yieldingly maintainingsaid brush holders in engagement with the commutator.

2. In a dynamo electric machine, the combination with the dynamo frameand the commutator supported thereby; of brush mounting means andbrushes supported thereby for cooperation with said commutator, saidbrush mounting means being 're- .mounting means and brushes supportedthereby for cooperation with said commu tator, said brush mounting meansincluding a mountin plate for supporting said brushes; sald plate havingmounting provisions; and devices arranged to cooperate with saidprovisions to secure said mounting plate tosaid dynamo frame, and in amanner such that said plate may be removed without disassembling otherportions of said machine.

4. In a dynamo electric machine, the combination with the dynamo frameand the commutator supported thereby; of brush mounting means andbrushes supported thereby for cooperation with said commutator; saidbrush mounting means including a mounting plate for supporting saidbrushes; said plate having hook portions; and bolts arranged to beengaged by said hook portions, and having threaded engagement with saidframe, whereby to secure said plate to said frame, the loosening of saidbolts permitting removal of said mounting plate without disassemblingother portions of'said machine.

5. In a bipolar dynamo electric machine, the combination with the dynamoframe and the commutator supported thereby; of brushes disposed onopposite side of said commutator; brush mounting means-includ 'ing amounting plate and brush holders supported thereby; said plate havingmounting provisions; and devices arranged to cooper- .ate with saidprovisions to secure said mount ing plate to said dynamo frame, and in amanner such that said plate may be removed without disassembling otherportions of said machine.

In testimony whereof we affix our signatures.

CHARLES F. KETTERING. WILLIAM A. CI-IRYST. Witnesses:

HAZEL SOLLENBERGER, MILDRED Pram.-

